$Which\ of\ the\ angles\ above\ has\ an\ angle\ of\ 90\degree\ ?$   

 $There\ are\ 3\ angles\ on\ a\ straight\ line.\ \angle\ X\ =\ 42\degree.\ \angle\ Y\ =\ 39\degree.\ Find\ \angle\ Z\ !$  

 $Angles\ around\ a\ point\ add\ up\ to\ 360\degree.\ Find\ \angle\ X\ !$  

 $True\ or\ False\ \angle\ b\ =\ \angle\ m.\$  

 $True\ of\ False\ \angle\ a\ =\ \angle\ b$  

 $If\angle b=130\degree\ and\ \angle n\ =\ 50\degree\ ,\ Find\ \angle m\ !$  

RS and PQ are straight lines.